SiN Episodes is the title of a series of episodic games for the PC that would have expanded upon the 1998 computer game SiN. A total of nine episodes were planned with only the first one released. Developed by Ritual Entertainment and powered by the Source engine, the first episode "Emergence" was the first computer game by a major developer to both be produced episodically and delivered over the Internet without the intervention of a publisher. This was accomplished through Valve Corporation's Steam content delivery system.
In 2007, Ritual was acquired by casual game developers MumboJumbo, stalling the franchise and leaving the future of the series uncertain. With the sale of Ritual to MumboJumbo and departure of several employees, all future development of Sin Episodes appears to be delayed indefinitely, if not entirely canceled. MumboJumbo has already tasked Ritual to develop "high-quality casual content."